(57) A PAL encoder comprises phase converter (1), first and second low-pass filters (2,3),
a burst signal adder (4), a chrominance subcarrier generator (6), and a modulator
(5). The phase converter (1) converts digital first and second color-difference signals
into digital U-axis and V-axis signals. The first and second low-pass filters (2,3)
pass low-frequency components of the digital U-axis and V-axis signals to produce
band-rejected U-axis and V-axis signals, respectively. The burst signal adder (4)
adds a predetermined burst signal to the band-rejected U-axis and V-axis signals to
produce burst-added U-axis and V-axis signals, respectively. The chrominance subcarrier
generator (6) outputs digital sine and cosine signals of the chrominance subcarrier.
The modulator (5) multiplies the burst-added U-axis signal by the sine signal and
the burst-added V-axis signal by the cosine signal and adds the multiplied results
to produce a digital chroma signal.
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